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SB 831

Geologic hazards: California Geological Survey.

2025-2026 Regular Session Introduced by Monique Limón and 1 co-sponsor

SB 831 expands California Geological Survey's authority to map, assess, and publicly communicate geological hazards statewide to improve public safety and land-use decision-making.

Chaptered by Secretary of State. Chapter 236, Statutes of 2025.
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Bill Summary · SB 831

Legislative bill overview

SB 831 expands the California Geological Survey's authority and responsibilities regarding geologic hazard mapping, assessment, and public information dissemination. The bill became law in October 2025 and establishes new requirements for the state agency to identify, evaluate, and communicate geological risks to property owners and the public.

Why is this important

California faces significant geologic hazards including earthquakes, landslides, subsidence, and volcanic activity that threaten public safety and property. Enhanced geological survey capabilities directly inform land-use planning, building code development, and help residents make informed decisions about property purchases and risk mitigation in vulnerable areas.

Potential points of contention

  • Cost and funding: Expanded survey duties may require substantial new appropriations; unclear whether adequate resources were allocated
  • Property value impacts: Detailed hazard mapping could affect real estate markets by revealing risks, potentially lowering property values in affected areas
  • Local control vs. state oversight: Expanded state geological authority may conflict with local land-use planning decisions and jurisdictional authority

Compiled from official sources — confirm details with the bill’s official record.

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